Hi Martin,
I may have a related idea I am looking to implement for GeoTools 14.x - I
would like to make our query system take expressions (rather than just
property names). I had originally intended this for a "java views feature".
The other thing I would like to do for make it easier to match up our
geotools functions with their opposite in SQL.
Combining the two features results in something similar to the SQL View you
are proposing, but with greater visibility to GeoTools on what is going on
and the chance to reduce query data size.
Still this issue is getting fairly deep, you may wish to attend one of the
community Skype meetings.
--
Jody
--
Jody Garnett
On 10 March 2015 at 11:00, Martin Davis <mtncl...@gmail.com> wrote:
> We're working on tuning a GeoServer implementation over an Oracle SDO
> database. We think we are seeing that the network latency of queries is the
> hotspot in the performance of GeoServer render requests.
>
> It seems that for some situations one way to reduce the data being pushed
> over the wire is to reduce the data size in the database query. In
> particular, for some datasets of polygons we're happy just to see points
> representing the polygons. So we tried using a SQLView with a statement
> like:
>
> select GEOMETRY, SDO_GEOM.SDO_CENTROID(GEOMETRY, 1) PT from CUT_BLOCK_SP
>
> and then used an SLD <Geometry> selector to render just the point.
>
> However, this doesn't work because we get the dreaded ORA-13226:
> interface not supported without a spatial index error. This is because
> GeoServer is actually emitting the query
>
> SELECT PT as PT FROM (select GEOMETRY, SDO_GEOM.SDO_CENTROID(GEOMETRY, 1)
> PT from CUT_BLOCK_SP t) VTABLE WHERE SDO_FILTER(PT, ?, 'mask=anyinteract
> querytype=WINDOW') = 'TRUE'
>
> and there is no index defined on the PT column.
>
> Now, this would work if GeoServer could emit the query:
>
> SELECT PT as PT FROM (select SDO_GEOM.SDO_CENTROID(GEOMETRY, 1) PT from
> CUT_BLOCK_SP t) VTABLE WHERE SDO_FILTER(GEOMETRY, ?, 'mask=anyinteract
> querytype=WINDOW') = 'TRUE'
>
> Is there any way to get this to happen?
>
> Or does anyone have other ideas about how to reduce query data size on
> Oracle?
>
>
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